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The Endowment for Human Development
The Endowment for Human Development
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Right- and Left-Handedness


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: A las 8 semanas, el 75% de los embriones demuestran ser diestros. Del resto, la mitad demuestra ser zurdos y la otra mitad no demuestra ninguna preferencia. Ésta es la primera evidencia de comportamiento diestro o zurdo.

All ages referenced to fertilization, not last menstrual period.
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